parental smoking as a risk factor for wheezing and early...
TRANSCRIPT
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Parental smoking as a
risk factor for wheezing and early onset asthma
Z. Živković
Children’s hospital for lung diseases and TB Medical Center “Dr Dragiša Mišović”, Belgrade
US MEDICAL SCHOOL, EUROPEAN UNIVERSITY OF BELGRADE
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Disclaimer
• I have nothing to declare
• No financial or pharmaceutical conflicts for my presentation
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Risk factors for development of asthma
Almost nothing is known about the role of intrauterine factors and fetal environment that might have been implicated in asthma development
Influences in utero :
immune responses
inadequate oxygenation
lung maturation
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The most important risk factors for early life respiratory events
• Maternal smoking during pregnancy
• Reduced lung function at birth
• Atopy
• Viral infections
• Ethnic background
• Gender
• Genetics
• Environmental factors
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TOBACCO EXPOSURE AND ASTHMA IN
PRESCHOOL AGES
MS MNS
No RI <5 (84,4%) <5 (86,7%)
No wheezing <5 (82,2%) <5 (88,4%)
Antibiotics <3 (29,5%) <3 (32,1%)
Prophylaxis ICS 75,5% ICS 55,3%**
SPT + (94,4%) + (93,6%)
Serum IgE 442IU/ml 509IU/ml
Eczema + (42%) + (43%)
**SN
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TOBACCO EXPOSURE AND ASTHMA IN
PRESCHOOL AGES
MS MNS
No RI <5 (84,4%) <5 (86,7%)
No wheezing <5 (82,2%) <5 (88,4%)
Antibiotics <3 (29,5%) <3 (32,1%)
Prophylaxis ICS 75,5% ICS 55,3%**
SPT + (94,4%) + (93,6%)
Serum IgE 442IU/ml 509IU/ml
Eczema + (42%) + (43%)
**SN
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Allergic sensitization during fetal life -facts-
• Gestation and early childhood - the most influential periods with regard to atopic expression
• Higher total IgE levels in cord blood associated with increased risk for atopic disease in infancy - including atopic dermatitis, urticaria , food allergy BUT not for asthma
• Maternal IgE does not cross the placenta
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Influences of the fetal environment
• In utero exposure to maternal smoking without postpartum exposure to environmental tobacco smoke increases the risk of a childhood asthma, although exposure to environmental tobacco smoke during childhood was related to wheeze but not asthma
Gilliland FD, Li YF, Peters JM. Effects of maternal smoking
during pregnancy and environmental tobacco smoke on
asthma and wheezing in children. Am J Respir Crit Care Med
2001;163:429–36.
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Asthma in mothers
• Umbilical artery flow velocity was found to be significantly reduced at 18 weeks’ gestation in moderately and severely asthmatic mothers
• Intrauterine exposure to beta agonists and poorly managed maternal asthma have been associated with asthma development in children
Clifton VL, Giles WB, Smith R, et al. Alterations of placental
vascular function in asthmatic pregnancies. Am J Respir Crit
Care Med 2001;164:546–53.
Bjorksten B, Finnstrom O, Wichman K. Intrauterine exposure
to the beta-adrenergic receptor-blocking agent metoprolol and
allergy. Int Arch Allergy Immunol 1988;87:59–62.
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Growth and development of the respiratory
system
• Take place mainly during the pre-natal
and early post-natal periods
• Adverse effects of pre-natal exposures, such as tobacco smoking of the mother, on lung development are well documented
Stocks J, Dezateux C. The effect of parental smoking on
lung function and development during infancy. Respirology
2003; 8: 266–285.
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Impact of air pollution on lung development
If present at an early developmental stage are suggestive of :
• respiratory need due to increased resistance (smaller airways),
• decreased compliance (smaller or stiffer airways) and/or
• factors influencing control of breathing (hypoxia)
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Possible hypothesis Inflammation of the mother’s airways after
exposure to air pollution may affect the blood–air barrier
reduced fetal breathing movements
decreased alveolarisation
decreased placental blood flow
reduced transfer of nutrients to the foetus
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Tobacco smoke exposure
Maternal smoking
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Smoking and Nicotine
• Increased airway resistance in term babies and decreased conductance in premature babies with smoking mothers (Stocks 98,99)
• Nicotine in fetal monkeys reduced alveoli and increased airway collagen (Sekhon et al 1999)
• Rats pups of smoking mothers have reduced alveolar development (Massaro 1996)
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Important effect of maternal smoking
• 60 newborns - smoking mothers compared with 62 newborns - non-smoking mothers
• cord blood mononuclear cell (CBMC) responses to toll-like receptor (TLR) ligands were attenuated for tumour necrosis factor α, IL-6 and IL- 10
• In utero exposure affects future wheeze susceptibility via an effect on the innate immune system
• reduced natural immunity to early respiratory viral infections
Noakes PS et al. Maternal smoking is associated with impaired neonatal toll-like-
receptor-mediated immune responses. Eur Respir 2006;28(4):721
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Razvoj plućne funkcije
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KC Lodrup Carlsen, ERS 1997
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Immune responses
Atopy
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Immune system
• Impairment of the innate immune system in early life in infants who are likely to wheeze has been noted in those exposed to tobacco smoke and in those with pro-Th2 genotypes
• Infants destined to become atopic and asthmatic demonstrate a delay in maturation of the immune system in early life
Prescott SL et al. Transplacental priming of the human immune system to
environmental allergens: universal skewing of initial T cell responses toward
the Th2 cytokine profile.J Immunol 1998;160(10):4730
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T-cell response at birth
• At birth, T-cell responses are already
different between infants of atopic and non-atopic mothers
• The levels of Th2 related cytokines produced by CBMC are reduced in infants of atopic mother
• Th1 and Th2 cytokine levels in cord blood were reduced in infants who later developed asthma
• •
• Macaubas C et al. Association between antenatal cytokine
production and the development of atopy and asthma at age 6 years.
Lancet 2003; 362 (9391):1192
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Genes&Environment
Antenatal determinants of airway branching
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Genes and environment
• Genes (ADAM33)
• Maternal and foetal gluthatione metabolising enzyme phenotype
• Maternal atopy
• Maternal hypertension
• Maternal use of antibiotics
• Maternal diabetes
• Amniocentesis
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Viral infections
RSV BRONCHIOLITIS
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AJCCM 2000, 161, pp 1501-1507.
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Prematurity
Low birth weight
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Prematurity
• Premature air breathing during the alveolar phase
• Mechanical ventilation
• Corticosteroides in utero
• Surfactant
• Premature birth reason – infection
• Effect on lung development and function
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Reduced lung
function at birth
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Asthma
Atopy associated Persistent
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Tucson study – outcome of asthma and wheezing in the first 6 yr of life – follow
up through adolescence
Morgan WJ et al. AJRCCM 2005; 172: 1253-1258
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Dunedin study – longitudinal population
based study of childhood asthma followed to adulthood
Sears MR, NEJM 2003; 349: 1414-1422
Sears MR. NEJM 2003; 349: 1414-1422
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Change in Weight vs. Change in Lung Function
154 infants from a general population, recruited antenatally, studied at 1 & 12 months
• METHODS – Weight gain, VmaxFRC – Wheeze symptoms from questionnaires – Infant feeding practices determined
Thorax 2008; 63: 234-9
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The greater the weight gain, the lower the growth in lung function
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Identify a High Risk Group
• Babies of smoking mothers
• Patterns of weight gain
in first year of life
• Smoke exposure postnatally
• Obesity
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Key issues to bring home
• Antenatal Indoor Pollution
• Events in utero • Patterns of weight gain
• Viral infections • New onset of wheezing among females
(obese) in adolescence
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Action on Smoking-Public Health
• Ban smoking in public places
• Ban all tobacco advertising everywhere
• Ban selling of tobacco to children
• Raise the prices of tobacco
Who smokes a $50 cigarette?
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What is our working plan?
• Research on European and local
level
• More caution to environmental influences on pregnant women
• Identifie children from the risk groups EARLY
• Treatment and all other measures to protect lung function in children
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Hvala na pažnji! Thank you for your attention!